op art, movement that became prominent in the United States and Europe in the mid-1960s. Deriving from abstract expressionism, op art includes paintings concerned with surface kinetics. Colors were used in creating visual effects, such as afterimages and trompe-l'oeil. Vibrating colors, concentric circles, and pulsating moiré patterns were characteristic of op works by such artists as Victor Vasarely, Richard Anusziewicz, Bridget Riley, Yaacov Agam, and Larry Poons. A comprehensive exhibition of op art, entitled "The Responsive Eye," was organized by the Museum of Modern Art, New York City, in 1965.

or Optical art

Branch of mid-20th-century geometric abstract art that deals with optical illusion. Op art painters devised complex optical spaces by manipulating repetitive forms such as parallel lines, checkerboard patterns, and concentric circles or by creating chromatic tension from the juxtaposition of complementary colours, thereby creating the illusion of movement. Principal artists of the Op movement in the late 1950s and the '60s include Victor Vasarely, Bridget Riley (b. 1931), and Larry Poons (b. 1937).

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